I disagree with the notion that Mapleshade is a purveyor of unknowns. There are some indisputably stellar artists on Mapleshade. For instance, Hamiett Bluiett may be the finest baritone saxophonist to ever play the instrument. Even if you dispute that, you cannot dispute his pivotal role in the World Saxophone Quartet, which was one of the most popular Jazz outfits for decades. Far from an unknown, and well represented in the Mapleshade catalog. David Murray, Patato Valdez, Larry Willis, etc. are phenomenal, world class, internationally known artists that are also on Mapleshade recordings.
Its a source of continuous amazement to me how frequently I read indictments of adventurous labels like Mapleshade. Its true that not all of their recordings are outstanding. However, they have put together a catalog of some of the most diverse musical offerings of any that I am aware of. They even have a return policy that essentially lets you try before you buy. How great is that?! It seems to me that anyone even the least bit curious about music has much to explore here.